MTL7700 range DIN-rail mounting safety barriers

Transcription

1 Technical data MTL intrinsic safety solutions September 07 EPS7700 Rev MTL7700 range DIN-rail mounting safety barriers Removable terminals feed to other modules Relay and solid state switch modules Dual channel variants.mm per channel Proximity detector inputs Electronic fusing Direct replacement for MTL700 range barriers Compatible terminal numbering and safety descriptions Since its introduction in 98 the MTL700 range has established itself as the worldwide standard for safety barriers. Known for its quality and reliability, the MTL700 range is widely used in applications all over the world. The MTL7700 range follows closely in the footsteps of the MTL700, but as a DIN rail mounting barrier, providing quick and easy installation without the need for special hardware. Removable terminals are used for ease of installation, maintenance and for providing a loop disconnect by simply unplugging the terminals from the side of the module. Wire entry is also angled to assist wiring within limited space enclosures. MTL7700 barriers clamp simply and securely onto standard T-section DIN rail, simultaneously making a reliable IS earth connection. For applications where field power is required for switch inputs or -wire transmitters, the MTL7700 range provides a bussed power feed facility. When used in conjunction with the MTL7798 power feed module the user has a fully protected, electronically fused supply to many barriers with no additional wiring required. MTL7700 active modules are protected with an electronic fuse for the majority of applications. The MTL7798 active fused, power feed module can protect up to 0 other modules using the bussed power facility and provides a clear indication of a trip condition via a red LED. The MTL77X range of barriers offer a NAMUR compatible input and a choice of relay or solid state output. The solid state outputs are floating so switching to ground or from a power rail into an input is also possible. The solid state interface also provides a high frequency transfer for use in flow or rotation applications. Dual channel relay or solid state modules offer the highest packing density with only.mm per channel and when used in conjunction with the power bus, offer users the minimum of wiring with the maximum packing density and the lowest cost per channel. Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev 0097 September 07 + (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com The given data is only intended as a product description and should not be regarded as a legal warranty of properties or guarantee. In the interest of further technical developments, we reserve the right to make design changes.

2 SPECIFICATIONS Key barriers shown in blue For notes to 7 see 'Terminology' (later in this section) Model No. Safety description Polarities available Application Basic circuit Max. end- to-end resistance Vwkg at 0µA or (µa) MTL V Ω ma + ac Hazardous Safe Ω V V ma p Transmitters p See 'HOW THEY WORK' Switches 0 and See additional 8 diode 0 'ACTIVE / ELECTRONICALLY specification 7707P+ 8 7 p Transmitters, switches, PROTECTED BARRIERS' 0 8 diode controller outputs IIB / p p p V dc & V ac systems P+ 0 9 p V systems /- 0 7 p p V dc systems V dc systems p.9. 0 Controller outputs, solenoids p Transmitters ac p Controller outputs, solenoid valves P+ 8 9 p Controller outputs, solenoid valves IIB P p X 0 9 Prox sw input, solid state output and line fault detect See 'ACTIVE / ELECTRONICALLY PROTECTED BARRIERS' Vmax Fuse rating 0/ 0 77ac 0 00 p - or - Wire RTDs 9.0 () p (floating bridge) 9.0 () ac 0 00 p - Wire RTDs 9.0 (0.7) p (grounded bridge) 9.0 (0.7) p 9.0 (0.7) / p p Gas detectors ac p Pac 9 0 p Strain-gauge bridges /-/ac k p p p Strain-gauge bridges k ac 0 80 p Pac 7 7 p Strain-gauge bridges Strain-gauge bridges p V dc systems V dc systems p Controller outputs requires channels Controller outputs separate in IIC p Vibration probes p Vibration probes ac p Active dc & ac sensors Thermocouples ac 00 0 p.0. 0 { ac p a p Switch inputs / Signal returns diode 0.9V+Ω diode 0.9V+Ω / p p Transmitters diode Controller outputs, switches 0.9V+Ω P+ 8 9 p diode 0.9V+Ω p Transmitters p R p p a Terminals & 7 connected together * Diagrams show positive versions. All diodes reversed on negative versions. Additional diodes fitted on ac versions. Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com

3 HOW THEY WORK All MTL7700 range barriers are based on the same simple principle. Each channel contains two stages of pulse-tested Zener or forwardconnected diodes and an infallible terminating resistor. In the event of an electrical fault in the safe area, the diodes limit the voltage that can reach the hazardous area and the resistor limits the current. A fuse protects the diodes, and the two stages of voltage limitation ensure continued safety if either stage should fail. No active outputcurrent limiting circuits are employed. All models are certified ia for all zones and IIC for all explosive atmospheres (except MTL7707P+ and MTL779P+, 'ia' 'IIB'). TERMINOLOGY. Safety description The safety description of a barrier, eg 0Ω 00mA, refers to the maximum voltage of the terminating Zener or forward diode while the fuse is blowing, the minimum value of the terminating resistor, and the corresponding maximum short-circuit current. It is an indication of the fault energy that can be developed in the hazardous area, and not of the working voltage or end-to-end resistance.. Polarity Barriers may be polarised + or, or non-polarised ( ac ). Polarised barriers accept and/or deliver safe-area voltages of the specified polarity only. Non-polarised barriers support voltages of either polarity applied at either end. GENERAL SPECIFICATION Ambient temperature and humidity limits 0 to +0 C continuous working 0 to +80 C storage 9% RH Leakage current For basic barriers with a working voltage of V or more, the leakage current decreases by at least one decade per volt reduction in applied voltage below the working voltage, over two decades. For the MTL77ac/77ac it decreases by at least one decade for a 0.V reduction in applied voltage. Terminations Removable terminals accommodate conductors up to.mm (AWG). Hazardous-area terminals are identified by blue labels. Removal force >N Colour coding of barrier label Grey: non-polarised Red: positive polarity (MTL770 negative to transmitter ) Black: negative polarity White: dummy barrier, MTL7799 Weight 0g approx. End-to-end resistance The resistance between the two ends of a barrier channel at 0 C, i.e. of the resistors and the fuse. If diodes or transistors are present, their voltage drop (transistors ON) is quoted in addition.. Working voltage (Vwkg) The greatest steady voltage, of appropriate polarity, that can be applied between the safe-area terminal of a basic barrier channel and earth at 0 C for the specified leakage current, with the hazardous-area terminal open circuit. Mounting and earthing By mm Top Hat DIN rail DIMENSIONS (mm) Hazardousarea terminals Safe-area terminals. Maximum voltage (Vmax) The greatest steady voltage, of appropriate polarity, that can be applied continuously between the safe-area terminal of any barrier channel and earth at 0 C without blowing the fuse. For basic barriers, it is specified with the hazardous-area terminal open circuit; if current is drawn in the hazardous area, the maximum voltage for these barriers is reduced. The ac channels of basic barriers and most channels of overvolt-protected barriers withstand voltages of the opposite polarity also see circuit diagrams.. Fuse rating The greatest current that can be passed continuously (for 000 hours at C) through the fuse. 7. Star connection In star-connected barriers, the two channels are interlocked such that the voltage between them cannot exceed the working voltage, Vwkg: this allows for higher cable capacitance or inductance. 8. Maximum safe-area voltage (U m ) The maximum permissible safe-area voltage (U m ) for MTL7700 range barriers is ac/dc. Product top label 0 90 Installation and approval side label Colour-coded top label. MTL7700 RANGE KEY BARRIERS SUMMARISED TYPE APPLICATION KEY BARRIER Analogue input (low-level) Analogue input (high-level) Analogue output Digital (on/off) input Digital (on/off) output Resistance temperature detectors Thermocouples, ac sensors Transmitters, -wire, /0mA Controller outputs, one line earthed Controller outputs, neither line earthed Switches 77ac 770ac / Solenoids, alarms, LEDs 778 Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com

4 ACTIVE / ELECTRONICALLY PROTECTED BARRIERS ACTIVE / ELECTRONICALLY PROTECTED BARRIERS The following barriers have built-in overvolt protection, allowing their use with unregulated power supplies. In many applications, eg, sensor inputs or controller outputs, there is insufficient power available to blow the barrier fuse and this additional protection is not necessary. However, where the barrier is connected to a power supply, eg, for energising transmitters, switches, solenoids or local alarms, overvolt protection allows the barriers to be used with unregulated supplies and also gives protection against faulty wiring during commissioning. MTL770+ for 'smart' -wire /0mA transmitters The MTL770+ is a -channel shunt-diode safety barrier, with builtin electronic overvolt protection, for energising a -wire, /0mA transmitter in a hazardous area. It is powered from a positive supply of 0 V dc and delivers a /0mA signal into an earthed load in the safe area. It is proof against short circuits in the field and in the safe area and is extremely accurate. The MTL770+ will pass incoming communication signals up to 0kHz from a smart transmitter, while in the outgoing direction it will pass signals of any frequency likely to be encountered. Since the MTL770+ has no return channel for energising the load, the entire output of the single 8V channel is available to power the transmitter, providing high output capability. This channel is negatively polarised, and the safe-area signal is in fact the very current that returns through it from the hazardous area, the novel circuit being energised by a built-in floating dc supply derived from the external dc source of power. To prevent any leakage through the zener diodes and maximise the output voltage available at 0mA, the floating supply is given a rising voltage/current characteristic. A separate circuit limits the current to protect the fuse in the event of a short circuit in the hazardous area. With a supply, the barrier will deliver.v minimum at 0mA for the transmitter and lines and consumes typically ma at V operation. BASIC CIRCUIT Hazardous Tx + Safe /0mA Current limit Regulate 0mA Safety description 8V 00Ω 9mA Supply voltage 0 to V dc w.r.t earth Output current to 0 ma Voltage available to transmitter and 0mA with 0Ω load (negative w.r.t. 0mA with 00Ω load (negative w.r.t. earth) Accuracy ±µa under all conditions /0mA 0mA Load Safe-area load resistance 0 to 00Ω Supply current ma typical at 0mA and V supply 0mA maximum at 0mA and supply MTL7707+ for switch inputs and switched outputs The MTL7707+ is a -channel shunt-diode safety barrier similar to the MTL7787+ but with built-in electronic overvolt protection. It is intended primarily for safeguarding a hazardous-area switch controlling a relay, opto-coupler or other safe-area load from an unregulated dc supply in the safe area. The outgoing channel accepts supply voltages up to +V and is protected against reverse voltages: the return channel is unaffected by voltages up to +. In normal operation the protection circuit introduces only a small voltage drop and shunts less than ma to earth, so its overall effect is minimal. If the supply voltage exceeds about 7V, however, causing the Zener diodes to conduct or if the safe-area load has a very low resistance the supply current is limited automatically to 0mA, protecting the fuse and power supply and enabling the loop to continue working. BASIC CIRCUIT Hazardous Safe Safety description 8V 00Ω 9mA, terminals to 8V Diode, terminals - Supply voltage 0 to V dc with respect to earth Output current Up to ma available Maximum voltage drop (at 0ºC, current not limited) Iout x Ω + 0.V, terminals to Iout x Ω + 0.9V, terminals to Supply current Iout +.ma, supply <V Limited to 0mA, supply >8V or low load resistance MTL7707P+ for switch inputs and switched outputs, W Transmitters (IIB gases) The MTL7707P+ is a two-channel shunt-diode safety barrier similar to the MTL7787P+, but is designed for use with group IIB gases and features built-in electronic overvolt protection allowing use with unregulated power supplies up to V dc. It is intended primarily as a low cost solution for driving IIB certified -wire /0mA transmitters, but can also be used with controller outputs with current monitoring, solenoid valves and switches. To protect the fuse and enable the loop to continue working, the supply current is limited automatically at 0mA should the output be short-circuited or excess voltage applied. The given data is only intended as a product description and should not be regarded as a legal warranty of properties or guarantee. In the interest of further technical developments, we reserve the right to make design changes. Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com

5 BASIC CIRCUIT Hazardous LED, alarm solenoid etc. + Safe Current limit.ma Safety description 8V Ω 7mA, terminals to 8V Diode, terminals to Supply voltage 0 to V dc with respect to earth Output current Up to ma available Maximum voltage drop (at 0ºC, current not limited) Iout x 8Ω + 0.V, terminals to Iout x 0.Ω + 0.9V, terminals to Supply current Iout +.ma, supply <V Limited to 0mA, supply >8V or low load resistance MTL77 proximity sensor or switch input and relay output The MTL77 is a single channel switch/prox input barrier with changeover relay contacts acting as the safe area interface. Relay contacts provide a universal interface capable of switching a wide range of signals including ac, low level and high level voltages. Phase reversal is achieved by connecting the normally open or normally closed contacts as required. The power bus terminal may be used to connect the module to a power source. BASIC CIRCUIT Hazardous Safe Safety description 9mA Supply voltage.9 to dc with respect to earth Input characteristics Relay energised if input >.ma(<kω) Relay de-energised if input <.ma(>0kω) Relay Contacts V ac 0.A. Resistive dc, A. Resistive Supply current ma V Response time <0ms NC NO COM 0mA 0mA MTL77 proximity sensor or switch input with solid state output The MTL77 is a single channel switch/prox input barrier with an open collector solid state interface to the safe area equipment. The solid state switch is especially useful for high frequency switching apparatus including pulse and rotational sensors. The power bus terminal can be used to connect power to the module and the input power supply range makes the module suitable for use with unregulated supplies. BASIC CIRCUIT Hazardous + Safe Safety description 9mA Supply voltage 0 to V dc with respect to earth Input characteristics Output energised if input >.ma(<kω) Output de-energised if input <.ma(>0kω) Output characteristics Operating frequency dc to.khz Max off-state voltage V Max off-state leakage 0µA Max on-state voltage drop 0mA, ma typically <V Max on-state current 0mA Supply current 0mA V MTL77 channel proximity sensor or switch input and relay outputs The MTL77 is a dual channel switch/prox sensor input barrier with a relay interface. This module is ideal for applications where high channel packing densities are required for digital inputs. Power is connected using the power bus terminal. BASIC CIRCUIT Hazardous Safe Safety description 9mA Supply voltage.9 to dc with respect to earth Input characteristics Relay energised if input >.ma(<kω) Relay de-energised if input <.ma(>0kω) Relay Contacts AC V, 0.A. resistive; DC, A. resistive Supply current ma V Response time <0ms CH CH CH Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com

6 MTL77 channel proximity sensor or switch inputs with solid state outputs A dual channel version of the MTL77. This module provides two solid state interfaces for prox/switch inputs. Power is connected via the power bus. BASIC CIRCUIT Hazardous Safe Safety description 9mA 9mA Supply voltage 0 to V dc with respect to earth Input characteristics Output energised if input >.ma(<kω) Output de-energised if input <.ma(>0k ) Output characteristics Operating frequency dc to.khz Max off-state voltage V Max off-state leakage 0µA Max on-state voltage ma typically <V Max on-state current 0mA Supply current 9mA V MTL77 proximity sensor or switch input with relay output and line fault detect The MTL77 is a single channel switch/prox input barrier providing line fault detection. Proximity detectors or switches fitted with end-ofline resistors may be connected. Short circuit or open ciruit conditions in the field wiring will generate an alarm condition. The LFD relay contacts close when a fault is detected allowing the contacts to be connected in parallel to provide a common alarm. The power bus terminal can be used to connect power to this module. CH CH Relay contacts V ac 0.A. Resistive dc, A. Resistive Supply current 8mA V Response time <0ms MTL7798 Power feed and protection module The MTL7798 power feed module incorporates both voltage and current sense mechanisms to protect barrier circuits by activating a solid state trip mechanism when fault or overload conditions occur in the power source circuit. Resetting the module after tripping is achieved by interupting the supply to the unit. A red LED indicates a circuit trip condition and a green LED the availability of power at the outputs. for other modules is sourced from the top of the unit using the Bus Power Link BPL7700 or via terminals and. BASIC CIRCUIT Hazardous Input voltage range (terminals &) 0 to.8v Maximum input voltage capability V Power source requirements >.8A Trip mechanism Minimum 0 C (+8mV/ C) Output current range 0 to 800mA Maximum voltage drop 800mA load Safe Current sense Voltage sense Trip circuit Output Input BASIC CIRCUIT Hazardous Safe 0R 0K + LFD LFD COM CH Safety description 9mA Supply voltage.9 to dc with respect to earth Input characteristics Output energised if input >.ma(<kω) Output de-energised if input <.ma(>0kω) LFD relay + Red LED Energised if input <0µA or <00Ω Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com

7 MTL7700 RANGE BARRIER APPLICATIONS MTL7700 range barriers protect devices located in all normally occurring explosive atmospheres, including air/flammable gas mixtures, dusts and fibres. Applications covered include the protection of installations incorporating uncertified devices ( simple apparatus ) such as thermocouples, switches and resistive sensors, or separately certified energy storing (or voltage producing ) apparatus including ac sensors, transmitters and current-to-pneumatic (I/P) converters. Recommended choices for specific applications are discussed briefly in the following pages. ANALOGUE INPUTS (HIGH LEVEL) -wire transmitters, /0mA, conventional and smart The recommended barrier for use with 'conventional' and 'smart' /0mA transmitters (fed by a V regulated supply) is the MTL This provides up to.9v (.V for MTL7787P+) at Vwkg and 0mA for a transmitter and its lines as well as V for the typical 0Ω load. This application and this barrier is suitable for use with the optional power bus facility. Hazardous Safe Power Bus MTL770+ MTL7787+ MTL7787P+ MTL mA Power +V Signal -V 0W The MTL770+ is recommended for applications where an unregulated supply of up to V is used. It provides. for conventional and Smart transmitters at 0mA, as well as V for a typical 0Ω load. With the MTL770+ terminal is negative with respect to earth, so the connections to terminals and should be reversed. Power Bus Power +V MTL7788R+ 0Ω -V Vibration probes The -wire transmitters used with vibration monitoring equipment are invariably supplied by a V dc power supply hence the recommended barrier choice is the negatively-polarised MTL779. Transducer Probe driver MTL779- Monitor Power -V V out ANALOGUE INPUTS (LOW-LEVEL) Compensating cable Thermocouples and mv sources The recommended barrier for thermocouples and mv sources is the MTL770ac. This -channel non-polarised barrier retains the earthfree nature of the signal and, providing the receiver s input floats, rejects common-mode ac and dc interference up to at least 7V and is unaffected by earth faults on the primary element. MTL770ac MTL77ac MTL7778ac Recorder Controller Data logger Computer AC sensors, photocells, microphones and turbine flowmeters The MTL770ac is the recommended choice for these devices. While many of these are designated simple apparatus and thus do not need certification, note that some ac sensors may be subject to a significant level of inductance and will therefore need to be designed and certified for hazardous-area locations. Photocell Microphone Turbine Flowmeter MTL770ac Earth free signal Slidewire displacement transducers The simplest choice is the MTL770ac. This barrier supplies power and brings back a unipolar signal. MTL770ac +. V out The given data is only intended as a product description and should not be regarded as a legal warranty of properties or guarantee. In the interest of further technical developments, we reserve the right to make design changes. Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com 7

8 RTDs For -wire RTDs, a single MTL77ac barrier is the most economical choice. This is suitable for use with a floating bridge the two leads from the bridge arms are protected by the barrier with the third (supply) lead being earthed through the barrier. The barrier has a low end-toend resistance of only 9Ω/channel to minimise span changes and its channels track within 0.Ω (between 0 C and +0 C) to minimise zero shift with temperature. Hazardous Safe MTL77ac Receiver If the bridge circuit is already earthed, the third barrier channel provided by an MTL77ac is needed. For extreme accuracy, channels and an earth-free bridge can be used, a configuration that cancels out the small errors due to barrier leakage. Channels and (those between terminals & and & respectively) track to within 0.Ω (between 0 C and 0 C). MTL77ac 7 Receiver MTL77ac MTL77ac -wire constant-current circuits do not need matched barrier resistances and can be protected by two MTL77ac barriers. If the increase in loop resistance is too great, use two MTL77ac barriers instead. Receiver MTL77ac MTL77ac STRAIN-GAUGE BRIDGES Single strain-gauge bridges This shows an arrangement using two or three barriers, which is safe in IIC gases. MTL77ac +V --V With the MTL77ac, the circuit is powered from a V (±V), Ω (07Ω + 07Ω) source. If the resistive bridge elements are 0Ω, then the voltage applied to the bridge will be.v, and if the bridge resistances are 0Ω, then the bridge's applied voltage will be 7.V. An MTL77ac can be used to sense the bridge supply voltage. An MTL77ac is used here for the mv output. MTL77ac + Sense MTL77ac Output (mv) Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com 8

9 STRAIN-GAUGE BRIDGES (cont) Double strain-gauge bridges Quite frequently there is a demand to monitor two load cells, and a possible circuit, safe in IIC, is shown. Hazardous Safe Here, the lower voltage drop of the MTL77Pac is an advantage. The MTL77Pac supplies power to the bridge(s) while two MTL77Pac barriers interface with the sense and pick-off circuits. Using 0Ω bridge systems, the following voltages are available from an MTL77Pac with a ± supply: MTL77Pac + -- bridge:.v bridges: 9.7V MTL77Pac + Sense MTL77Pac Output (mv) ANALOGUE OUTPUTS Controller outputs (I/P converters) The single-channel MTL778+ with a voltage drop of.v at 0mA is the recommended choice for most controller outputs. Higher-power versions are available: the MTL778P+ (.V drop) is suitable for IIC applications; the MTL779P+ (.8V drop) for IIB applications. P I MTL778+ +V For controllers with an output circuit separated from the rail by the control transistor, the -channel MTL7787+ is the preferred choice as the return channel can handle up to.v allowing the control signal to be turned off completely. The voltage drop is 8.V at 0mA. A higherpower version of the latter, the MTL7787P+, is also available. The return channel of these barriers handle up to.v and the maximum voltage drop is only.8v. P I MTL7787+ MTL7787P+ +V The MTL7787+ and MTL7787P+ are also suitable for controllers containing a resistor which enables the return current to be monitored for high-integrity operation. P I MTL7787+ MTL7787P+ +V Monitor rail Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com 9

10 DIGITAL (ON/OFF) INPUTS Switches The normal choice is the MTL7787+/7787P+ with a regulated supply. The MTL77X modules are recommended for applications where an unregulated supply of up to for relay output modules, or V for solid state output modules, is used. The MTL7789+ offers a dual channel passive barrier for switch inputs where the input current for each channel is <0mA. Hazardous Safe Power Bus MTL7787+ MTL7787P+ Power +.V Signal Power Bus 7 8 MTL7789+ Power +.V Logic signal Power +.V Logic signal Switches / Proximity detectors Eaton's MTL range of new switch/prox input barriers provide the user with a choice of relay and solid state outputs in single and dual channel versions. The MTL77 is single channel with a changeover relay output. Power Bus.9V - NC 7 8 MTL77 COM NO Power Bus The MTL77 has a single channel solid state switch that can be configured to switch from a power rail or down to ground. This is also ideal for high switching frequency applications. + - V MTL77 Logic signal Logic signal The MTL77 and MTL77 are dual channel versions affording very high packing densities. Power must be provided to these modules using the power bus facility. 7 8 Power MTL77 MTL77 Logic signal Logic signal Power Bus The MTL77 is a single channel proximity input (or switch input if end of lines resistors are fitted) with relay contacts providing switch and line fault status. The LFD relay contacts close when a fault is detected. 0Ω 0kΩ MTL LFD COM CH Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com 0

11 DIGITAL (ON/OFF) OUTPUTS Alarms, LEDs, solenoids valves, etc For these applications, the MTL778+ is recommended. Higherpowered versions are available: the MTL778P+ is suitable for IIC applications; the MTL779P+ for IIB applications. If the control switch is to earth, then the -channel MTL7787+ barrier should be used, or, alternatively, the MTL7787P+ higher-power version. If the supply is poorly regulated use the MTL Hazardous LED, alarm Safe MTL7707+ MTL778+ MTL778P+ MTL779P+ +.9V The MTL7707+ is recommended for applications where an unregulated supply of up to V is used. LED, alarm MTL7707+ MTL7787+ MTL7787P+ +V POSITIVE DC SYSTEMS Low-level to V dc systems The two channels of the MTL77+ and MTL777+ can be combined safely in IIC. The MTL77+ can be used for low-level logic return signals whilst the MTL777+ is used for V dc and V dc systems. dc systems MTL77+ MTL777+ +/+V +/+V 8V dc systems The single-channel MTL77+ is recommended for 8V dc systems. dc systems MTL V AC AND DC SYSTEMS High-level ac and dc systems The versatile star-connected MTL77ac and MTL7778ac allow Vwkg to be developed from each channel to ground but only allow Vwkg to be developed between channels. This provides some common-mode voltage capability and can allow higher cable parameters to be used. dc and ac systems MTL77ac MTL7778ac ~ V/V NEGATIVE AND FLOATING POWER SUPPLIES Digital (on/off) outputs The MTL778 is used with a negative power supply and positive earth. Typically used for digital inputs or outputs, as shown. The MTL778-- can also be used with floating power supplies, for transmitters. LED, alarm MTL V SPARE CABLE CORES AND SCREENS The MTL7799 dummy barrier is used primarily for securing and earthing unused cables and screen connections. Hazardous area terminals and are internally connected to the DIN-rail mounting/ earth connection. It also provides a power bus connection for direct connection of power for modules such as the MTL77 and MTL77 where no power supply screw terminal is provided. Unused cable cores and screens MTL7799 Vdc Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com

12 POWER BUS APPLICATIONS The PB7700 power bus is invaluable for saving installation time and wiring when connecting a V dc power source to a number of barriers. Hazardous Safe Typical applications include hazardous-area switches, /0mA transmitters and proximity detectors. The diagram illustrates the configuration for barriers but up to 0 barriers can be served by this method. The MTL7798 power feed module would normally be used with standard barriers such as MTL7787+ and MTL7787P+ because the current/voltage trip protection mechanism of the MTL7798 protects the fuses in the barriers. MTL7798 (MTL7799) Power connections when using 7799 Power connections when using 7798 The MTL7799 dummy barrier can be used instead of the MTL7798 for direct feed-through connection of a V dc supply onto the power bus. Looping the power feed to each end of the bussed power allows the removal of individual barriers without loss of power to others in the chain. Other units that can use the power bus facility: MTL770 MTL7787+ MTL7787P+ Power looped between ends to allow removal of a module from middle of row Logic signal MTL7707+ MTL7707P+ MTL77 MTL77 MTL77 MTL77 MTL770+ MTL7787+ MTL7787P+ -V 0W MTL77 MTL7787+ MTL7787P+ Power Bus PB7700 MTL7788+ MTL7788R+ MTL MTL77 Contact signals } Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com

13 MTL7700 RANGE ACCESSORIES IMB7 Insulating mounting block One required at each end of a tagging strip/earth rail. Suitable for lowprofile (7.mm) and high-profile (mm) symmetrical DIN rail. TGL7700 TAG7 mm ERB7O Snap off extension when using IMB7 as a central support IMB7 8mm 0mm earth clamp 8mm ETM7 ERL7 mm earth-rail clamp THR/THR7000 ERB7S in lower position ETL7000 ISP7000 mm mm ERB7O Earth-rail bracket, offset Nickel-plated; supplied with two push fasteners, one mm earth-rail clamp and one 0mm earth clamp for cables mm. MOUNTING/EARTHING ACCESSORIES MTL7700 range barriers mount easily and quickly onto standard DIN rail which also acts as the intrinsically safe earth. 0mm mm THR standard DIN rail THR7000 plated rail Specially nickel-plated T-section (mm x 7.mm) DIN rail for use in potentially corrosive atmospheres. Supplied in meter lengths. 7mm 7 7. ISP7000 insulating spacers Attached to the base of a DIN rail at either end or at intervals (depending upon DIN rail length) to isolate the IS earth from a structural earth..mm 0mm mm ETL7000 earth terminal Provides connection for routing the IS earth from the DIN rail to an appropriate plant earth. Maximum cable cross-section is 0mm. Two recommended per discrete length of DIN rail. See instruction manual INM7700 for more details. M x Ø. M x 0. 8 over DIN rail. 0 0 ERB7S Earth-rail bracket, straight Nickel-plated; supplied with two push fasteners, one mm earth-rail clamp and one 0mm earth clamp for cables mm (See ERB70). 0mm 0mm ETM7 earth terminal For terminating cable screens and earth returns and securing spare cores to the earth rail. A maximum of two ETM7s per barrier can be accommodated. mm BPL7700 Power Bus link When a number of barriers use a common power supply, the optional power link (BPL7700) can be used. Typical applications include hazardous area switches, solenoids and 0mA transmitters. The barriers it can be used with are the MTL770, MTL7707+, MTL7787+, MTL7787P+, MTL7789P+ and MTL77X. See next page for further details. mm The given data is only intended as a product description and should not be regarded as a legal warranty of properties or guarantee. In the interest of further technical developments, we reserve the right to make design changes. Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com

14 TAGGING ACCESSORIES Two methods of tagging are available which can be used separately or together: ) Individual barrier identification TH7700 barrier identifiers TH7700 barrier identifiers are supplied clipped on to the tops of individual barriers to provide transparent holders for identification labels. TH7700 HOW TO ORDER MTL7700 barriers Select by barrier number and polarity, e.g. MTL778+ Mounting accessories THR Standard DIN-rail, x 7.mm THR7000 T-section DIN-rail, specially-plated, x 7.mm, m length ISP7000 Insulating spacer ADB700 Adaptor bracket to convert MTL700 Standard earthing/earth-rail accessories ETL7000 Earth terminal, DIN-rail mounted IMB7 Insulating mounting block ERB7S Earth-rail bracket, straight ERB7O Earth-rail bracket, offset ERL7 Earth rail, m length ETM7 Earth terminal, pack of 0 ) Tagging strip method TAG7 Tagging strip, m length Cut to size. Supplied with reversible tagging strip label suitable for either MTL000 or MTL7000 range module spacing. TGL7700 Tagging strip labels, set of 0 x 0.m For use with TAG7 tagging strip. Tags are reversible - one side for MTL7700, the other for MTL700. MTL700 BUSBAR ACCESSORY ADB700 Adaptor bracket, MTL7700 Tin-plated; supplied with two M screws and washers. For mounting an MTL7700 range barrier to an MTL700 busbar (EBB7). Note: This is only to be used when the EBB7 is supported by IMB7 insulating mounting blocks, it should not be used with the smaller SMB7 mounting blocks. Standard tagging accessories TAG7 Tagging strip, m length TGL7700 Tagging strip labels, set of 0 x 0.m links BPL7700 Pack of 00 Enclosures DX070 Enclosure, for MTL7700 x DX70 Enclosure, for MTL7700 x DX0 Enclosure, for MTL7700 x Spares (all in packs of 0) SAF77 Safe-area terminals & HAZ77 Hazardous area terminals & SAF77 Safe-area terminals & HAZ7778 Hazardous area terminals 7 & 8 TH7700 Tag holder Literature INM7700 INA7700 INM7ENC CD Instruction manual, MTL7700 range ATEX information, MTL7700 range Instruction manual, MTL000/7000 range Enclosures Customer drawings Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com

15 APPROVALS (for the latest certificate information and cable parameters, see /certificates) Region (Authority) UK (BASEEFA) UK (BASEEFA) Systems EN 009 USA (FM) Canada/USA (CSA) Japan (TIIS) Standard EN :0 EN 0079-:0 00, 0 entity, 80 CAN/CSA E0079 UL98, UL9, UL0 IEC0079, C. See Certificates Approved for [Ex ia Ga] IIC [Ex ia Ga] IIB [Ex ia Da] IIIC Ex ia IIC Ex ia IIB AIS/I,II,III//Entity ABCDEFG- SCI-9; NI/I//ABCD/T [I/0] AEx[ia]IIC SCI-9 Entity; NI///IIC/T Ta=0ºC except where Ta=ºC Class, Div, Gps A,B, C,D; Ex na [ia] IIC T Class, Zone, AEx na IIC T Ex (ia) IIC Ex (ia) IIB Model No. Certificate No. MTL770+ BAS0ATEX77 Ex0E MTL7707+ BAS0ATEX77 Ex0E MTL7707P+ BAS0ATEX78 Ex0E MTL770+/- BAS0ATEX77 Ex0E C MTL77+ BAS0ATEX77 Ex0E C MTL77P+ BAS0ATEX77 Ex0E C MTL77+/- BAS0ATEX77 Ex0E C MTL778+/ /ac BAS0ATEX77 Ex0E C97 MTL778P+ BAS0ATEX77 Ex0E C MTL779P+ BAS0ATEX78 Ex0E C MTL77 BAS0ATEX77 Ex0E C MTL77 BAS0ATEX77 Ex0E C MTL77 BAS0ATEX77 Ex0E C MTL77 BAS0ATEX77 Ex0E C MTL77 BAS0ATEX77 Ex0E C7 MTL77ac BAS0ATEX77 Ex0E C0 MTL77ac BAS0ATEX77 Ex0E C7 MTL778+/ BAS0ATEX77 Ex0E C8 MTL770ac BAS0ATEX77 Ex0E C9 MTL77ac BAS0ATEX77 Ex0E C8 MTL77Pac BAS0ATEX77 Ex0E MTL77+/- BAS0ATEX77 Ex0E C0 MTL77ac BAS0ATEX77 Ex0E C MTL77ac BAS0ATEX77 Ex0E C0 MTL77ac BAS0ATEX77 Ex0E C MTL77Pac BAS0ATEX77 Ex0E C MTL777+ BAS0ATEX77 Ex0E C MTL7778ac BAS0ATEX77 Ex0E C MTL7779+ BAS0ATEX77 Ex0E C MTL7787+ BAS0ATEX77 Ex0E C7 MTL7787P+ BAS0ATEX77 Ex0E C8 MTL7788+ BAS0ATEX77 Ex0E C9 MTL7788R+ BAS0ATEX77 Ex0E C9 MTL7789+ BAS0ATEX77 Ex0E C MTL779+ BAS0ATEX77 Ex0E C MTL779 BAS0ATEX77 Ex0E C MTL7798 NI only Note: For FM compliance, the MTL7700 range of barriers shall be installed in compliance with the enclosure, mounting, spacing and segregation requirements of the ultimate application. Certified to CENELEC IIB/FM Grps C-G only. USA (FM) T a = C See "Approved for" above Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com

16 CORRELATION BETWEEN MTL7700 MTL7000 MTL700 BARRIERS (IIC) Module No. Bussed Power MTL7000 Equivalent MTL7000 Original Certificate Number(s) MTL7000 ATEX Certificate Number(s) MTL700 equivalent MTL700 Original Certificate Number(s) MTL700 ATEX Certificate Number(s) Typical Application MTL770+/- No Half of MTL7+ Ex9C BAS99ATEX78 MTL70+/- Ex8 BAS0ATEX70 /V Systems MTL77+ No N/A N/A N/A MTL7+ Ex8 BAS0ATEX70 V Systems MTL77P+ No N/A N/A N/A MTL7P+ Ex9C7 BAS0ATEX70 V Systems MTL77+/- No MTL7+/- Ex9C BAS99ATEX78 MTL7+/- Ex8 BAS0ATEX70 General Purpose MTL778+/- No MTL708+/- MTL78+/- Ex9C BAS99ATEX78 MTL78+/- Ex8 BAS0ATEX70 Analogue / Digital MTL778ac No N/A N/A N/A MTL78ac Ex8 BAS0ATEX70 General Purpose MTL778P+ No MTL78P+ Ex9C BAS99ATEX78 MTL78P+ Ex9C7 BAS0ATEX70 Analogue / Digital MTL77ac No MTL70ac Ex9C BAS99ATEX78 MTL7ac Ex8 BAS0ATEX70 RTD, Grounded MTL77ac No MTL70ac Ex9C BAS99ATEX78 N/A N/A N/A RTD, Grounded MTL778+/- No N/A N/A N/A MTL78 Ex8 BAS0ATEX77 Active sensors, MTL770ac No N/A N/A N/A MTL70ac Ex8 BAS0ATEX70 Active sensors, Thermocouples MTL77ac No MTL7ac Ex9C BAS99ATEX78 MTL7ac Ex8 BAS0ATEX70 Strain Gauges MTL77Pac No MTL70Pac MTL7Pac Ex9C BAS99ATEX78 MTL7Pac Ex9C7 BAS0ATEX70 Load cell MTL77+/- No MTL7+/- Ex9C BAS99ATEX78 MTL7+/- Ex8 BAS0ATEX70 High resistance MTL77ac No MTL7ac Ex9C BAS99ATEX78 MTL7ac Ex8 BAS0ATEX70 Strain / Level Gauges MTL77ac No N/A N/A N/A MTL7ac Ex8 BAS0ATEX70 General Purpose MTL77ac No N/A N/A N/A MTL7ac Ex8 BAS0ATEX70 Strain Gauges MTL77Pac No MTL70Pac MTL7Pac Ex9C BAS99ATEX78 MTL7Pac Ex9C7 BAS0ATEX70 Strain Gauges MTL777+ No MTL77+ Ex9C BAS99ATEX78 MTL77+ Ex8 BAS0ATEX70 Dual MTL7 MTL7779+ No N/A N/A N/A MTL779+ Ex8 BAS0ATEX70 Dual MTL78 MTL7787+/- Yes MTL7087+ MTL787+ MTL7787P+ Yes MTL7087P+ MTL787P+ Ex9C BAS99ATEX78 MTL787S+ Ex8 BAS0ATEX70 Analogue / Digital Ex9C BAS99ATEX78 MTL787SP+ Ex9C7 BAS0ATEX70 Analogue / Digital MTL7788+ Yes N/A N/A N/A MTL788+ Ex8 BAS0ATEX70 Transmitters MTL7788R+ Yes N/A N/A N/A MTL788R+ Ex8 BAS0ATEX70 V systems MTL779+/- No MTL709- MTL79- Ex9C BAS99ATEX78 MTL79+/- Ex8 BAS0ATEX70 Vibration sensors Beds, LU 8DL, UK. Tel: + (0)8 7 Fax: + (0) Eaton EPS7700 Rev (0)8 7 mtlenquiry@eaton.com mtl-us-info@eaton.com sales.mtlsing@eaton.com